The ease of adsorption of the hydrates alkali metal ions on ion-exchange resins follows the order (1.) K^+ < Na^+ < Rb^+ < Li+ [AIPMT (Prelims) - 2012] (2.) Na^+ < Li^+ < K^+ < Rb+ (3.) Li^+ < K^+ < Na^+ < Rb ^+ (4.) Rb^+ < K^+ < Na^+ < Li^+

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